The first Pope of this name clashed with Elipandus of Toledo to condemn Adoptionism and took a line against iconoclasm at the Second Council of Nicaea. The sixth Pope of this 
The first Pope of this name clashed with Elipandus of Toledo to condemn Adoptionism and took a line against iconoclasm at the Second Council of Nicaea. The sixth Pope of this name taught both Erasmus and Charles V and was the last (*) non-Italian Pope prior to John Paul II. Another Pope of this name executed Arnold of Brescia and crowned Frederick Barbarossa as emperor. For 10 points, give the common name of these pontiffs, the fourth of whom was born Nicholas Breakspear and was the only English Pope.
The first Pope of this name clashed with Elipandus of Toledo to condemn Adoptionism and took a line against iconoclasm at the Second Council of Nicaea.
{Hadrian} or {Adrian}